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/*
* mdstat - parse /proc/mdstat file. Part of:
* mdadm - manage Linux "md" devices aka RAID arrays.
*
* Copyright (C) 2002 Neil Brown <neilb@cse.unsw.edu.au>
*
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Author: Neil Brown
* Email: <neilb@cse.unsw.edu.au>
* Paper: Neil Brown
* School of Computer Science and Engineering
* The University of New South Wales
* Sydney, 2052
* Australia
*/
/*
* The /proc/mdstat file comes in at least 3 flavours:
* In an unpatched 2.2 kernel (md 0.36.6):
* Personalities : [n raidx] ...
* read_ahead {not set|%d sectors}
* md0 : {in}active{ raidX /dev/hda... %d blocks{ maxfault=%d}}
* md1 : .....
*
* Normally only 4 md lines, but all are listed.
*
* In a patched 2.2 kernel (md 0.90.0)
* Personalities : [raidx] ...
* read_ahead {not set|%d sectors}
* mdN : {in}active {(readonly)} raidX dev[%d]{(F)} ... %d blocks STATUS RESYNC
* ... Only initialised arrays listed
* unused: dev dev dev | <none>
*
* STATUS is personality dependant:
* linear: %dk rounding
* raid0: %dk chunks
* raid1: [%d/%d] [U_U] ( raid/working. operational or not)
* raid5: level 4/5, %dk chunk, algorithm %d [%d/%d] [U_U]
*
* RESYNC is empty or:
* {resync|recovery}=%u%% finish=%u.%umin
* or
* resync=DELAYED
*
* In a 2.4 kernel (md 0.90.0/2.4)
* Personalities : [raidX] ...
* read_ahead {not set|%d sectors}
* mdN : {in}active {(read-only)} raidX dev[%d]{(F)} ...
* %d blocks STATUS
* RESYNC
* unused: dev dev .. | <none>
*
* STATUS matches 0.90.0/2.2
* RESYNC includes [===>....],
* adds a space after {resync|recovery} and before and after '='
* adds a decimal to the recovery percent.
* adds (%d/%d) resync amount and max_blocks, before finish.
* adds speed=%dK/sec after finish
*
*
*
* Out of this we want to extract:
* list of devices, active or not
* pattern of failed drives (so need number of drives)
* percent resync complete
*
* As continuation is indicated by leading space, we use
* conf_line from config.c to read logical lines
*
*/
#include "mdadm.h"
#include "dlink.h"
void free_mdstat(struct mdstat_ent *ms)
{
while (ms) {
struct mdstat_ent *t;
if (ms->dev) free(ms->dev);
if (ms->level) free(ms->level);
if (ms->pattern) free(ms->pattern);
t = ms;
ms = ms->next;
free(t);
}
}
struct mdstat_ent *mdstat_read()
{
FILE *f;
struct mdstat_ent *all, **end;
char *line;
f = fopen("/proc/mdstat", "r");
if (f == NULL)
return NULL;
all = NULL;
end = &all;
for (; (line = conf_line(f)) ; free_line(line)) {
struct mdstat_ent *ent;
char *w;
if (strcmp(line, "Personalities")==0)
continue;
if (strcmp(line, "read_ahead")==0)
continue;
if (strcmp(line, "unused")==0)
continue;
/* Better be an md line.. */
if (strncmp(line, "md", 2)!= 0
|| atoi(line+2)<0) {
fprintf(stderr, Name ": bad /proc/mdstat line starts: %s\n", line);
continue;
}
ent = malloc(sizeof(*ent));
if (!ent) {
fprintf(stderr, Name ": malloc failed reading /proc/mdstat.\n");
free_line(line);
fclose(f);
return all;
}
ent->dev = ent->level = ent->pattern= NULL;
ent->next = NULL;
ent->percent = -1;
ent->active = -1;
ent->dev = strdup(line);
ent->devnum = atoi(line+2);
for (w=dl_next(line); w!= line ; w=dl_next(w)) {
int l = strlen(w);
char *eq;
if (strcmp(w, "active")==0)
ent->active = 1;
else if (strcmp(w, "inactive")==0)
ent->active = 0;
else if (ent->active >=0 &&
ent->level == NULL &&
w[0] != '(' /*readonly*/)
ent->level = strdup(w);
else if (!ent->pattern &&
w[0] == '[' &&
(w[1] == 'U' || w[1] == '_')) {
ent->pattern = strdup(w+1);
if (ent->pattern[l-2]==']')
ent->pattern[l-2] = '\0';
} else if (ent->percent == -1 &&
strncmp(w, "re", 2)== 0 &&
w[l-1] == '%' &&
(eq=strchr(w, '=')) != NULL ) {
ent->percent = atoi(eq+1);
} else if (ent->percent == -1 &&
w[0] >= '0' &&
w[0] <= '9' &&
w[l-1] == '%') {
ent->percent = atoi(w);
}
}
*end = ent;
end = &ent->next;
}
fclose(f);
return all;
}
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